River Plate's Leonardo Ponzio (L) and Boca Juniors' Pablo Perez vie for the ball during the second leg match of their all-Argentine Copa Libertadores final, at the Santiago Bernabeu stadium in Madrid, on December 9, 2018. (Photo by Javier SORIANO / AFP)

Boca Juniors' Uruguayan Lucas Olaza (R) and River Plate's Ignacio Fernandez vie for the ball during the second leg match of their all-Argentine Copa Libertadores final, at the Santiago Bernabeu stadium in Madrid, on December 9, 2018. (Photo by Javier SORIANO / AFP)

An argentinian fan cheers at the Santiago Bernabeu stadium in Madrid moments before the start of the second leg match of the all-Argentine Copa Libertadores final between River Plate and Boca Juniors, on December 9, 2018. (Photo by GABRIEL BOUYS / AFP)

A fan of Boca Juniors cheers as he walks to his seat at the Santiago Bernabeu stadium in Madrid just hours before the start of the second leg match of the all-Argentine Copa Libertadores final between River Plate and Boca Juniors, on December 9, 2018. (Photo by OSCAR DEL POZO / AFP)

Fans start getting to their seats at the Santiago Bernabeu stadium in Madrid, just hours before the start of the second leg match of the all-Argentine Copa Libertadores final between River Plate and Boca Juniors on December 9, 2018. (Photo by OSCAR DEL POZO / AFP)

River Plate supporters cheer ahead of the Copa Libertadores Final between River Plate and Boca Juniors in Madrid, Sunday, Dec. 9, 2018. Tens of thousands of Boca and River fans are in the city for the "superclasico" at Santiago Bernabeu Stadium on Sunday. (AP Photo/Olmo Calvo)

Fans of Boca Juniors in Buenos Aires' La Boca neighbourhood cheer for their team before the start of the second leg match of the all-Argentine Copa Libertadores final against River Plate to be played at the Santiago Bernabeu stadium in Madrid on December 9, 2018. - The second leg is held at the home of Real Madrid following the controversial decision of South America's football federation, CONMEBOL, to take the fixture out of Argentina following an attack by River Plate fans on the Boca Juniors team bus. (Photo by Alberto RAGGIO / AFP)